They also lost one before the F-117 was made public(that story involves a major recovery involving explosives and a cover story) and one was shot down over Yugoslavia back in the nineties those are the only three I know of but there may have been more.
http://www.f-117a.com/Timeline1.html this website has a detailed F117A timeline that lists all losses make sure you scroll all the way down.the one I mentioned above was in 1986.